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Related Experiment Videos

Accuracy of impression materials for complete-arch fixed partial dentures.

C C Lin1, G J Ziebert, S J Donegan

  • 1Marquette University, School of Dentistry, Milwaukee, Wis.

The Journal of Prosthetic Dentistry
|March 1, 1988
PubMed
Summary

Polyether impression materials provide the most accurate complete-arch replicas for fabricating fixed partial dentures (FPDs). Vinyl polysiloxanes were the second most accurate, while hydrocolloids were least accurate.

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Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Impression Techniques

Background:

  • Accurate impressions are crucial for fabricating well-fitting complete-arch fixed partial dentures (FPDs).
  • Various impression materials exist, each with potential differences in accuracy for complex dental archures.

Purpose of the Study:

  • To evaluate and compare the accuracy of 12 different complete-arch impression materials.
  • To determine which material type yields the most accurate replicas for FPD fabrication.

Main Methods:

  • Sixty complete-arch impressions were made using a maxillary dentoform model with canine and second molar abutments.
  • Master prostheses were fabricated and seated on stone casts; marginal adaptation was evaluated using a travelling microscope.
  • Individual marginal adaptation was assessed after sectioning the prosthesis joints.

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Main Results:

  • Polyethers demonstrated the highest accuracy in complete-arch replicas.
  • Vinyl polysiloxanes were the second most accurate, followed by polysulfides and hydrocolloids.
  • Polyether impression materials showed consistent accuracy for master cast fabrication.

Conclusions:

  • Polyethers are the most accurate impression materials for complete-arch FPDs.
  • The accuracy ranking from most to least accurate is: polyethers, vinyl polysiloxanes, polysulfides, and hydrocolloids.
  • Polyether materials offer reliable accuracy for fabricating complete-arch FPD master casts.